If `P(n ,5): P(n ,3)=2:1` find n

Explanation

To solve the problem where \( P(n, 5) : P(n, 3) = 2 : 1 \), we can follow these steps:

### Step 1: Write the formula for permutations
The formula for permutations is given by:
\[ P(n, r) = \frac{n!}{(n-r)!} \]
So, we can express \( P(n, 5) \) and \( P(n, 3) \) as:
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